Plunger type brake pump for automobile

Abstract

The utility model relates to the technical field of brake pumps, in particular to an automobile plunger type brake pump which comprises a brake pump body, a first push block is arranged at the rear end of a piston rod, a one-way circulation device is arranged on the rear surface of the first push block, a first sealing rubber mat is arranged on the rear surface of the first push block, and a second push block is annularly arranged on the surface of the piston rod. And a sealing device is arranged on the rear inner wall of the first brake cavity. The first sealing rubber mat forms a first sealing barrier, the sealing device forms a second barrier, even if the first sealing rubber mat is abraded due to long-time friction, the sealing device ensures that the brake pump is in a sealing state, and when the second sealing rubber mat is abraded, the abrasion loss can be compensated through the compression force of the third spring, so that the service life of the brake pump is prolonged. When the piston rod reaches the bottom, the pressure in the second brake cavity is too large, hydraulic oil cannot flow out of the two sealing barriers, and it is ensured that the brake pump achieves the desired brake effect.

Description

Technical Field

[0001] The utility model relates to the technical field of brake pumps, in particular to a plunger type brake pump for automobiles. Background Art

[0002] An automobile brake pump includes a brake cylinder, a piston rod moving in the cylinder, an oil inlet hole in the middle of the cylinder, and an oil outlet hole at the front end. The brake pump is an indispensable braking part in the automobile braking system, and its main function is to push the brake fluid to each brake cylinder to push the piston.

[0003] For example, the authorized announcement number "CN101239619B" is a kind of automobile brake pump. Although it adopts a double-position toroidal surface support between the piston rod and the cylinder, it runs stably, has good lubrication, the sealing ring is in a static working state, the sealing part is long, and the sealing is reliable. However, the piston rod and the sealing ring will wear after long-term friction. When the piston rod reaches the bottom, the pressure in the chamber near the oil outlet hole is too high, which will cause the hydraulic oil to flow out between the piston rod and the sealing ring, resulting in the brake pump not achieving the desired braking effect. Content of the Utility Model

[0004] The purpose of the utility model is to solve the defects existing in the prior art, and to provide a plunger type brake pump for automobiles.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Design a plunger type brake pump for automobiles, including a brake pump body. An oil inlet hole and an oil outlet hole are arranged on the upper surface of the brake pump body. A first brake chamber and a second brake chamber are arranged inside the brake pump body. The oil inlet hole is arranged above the first brake chamber, and the oil outlet hole is arranged above the second brake chamber. A piston rod is arranged inside the first brake chamber and the second brake chamber. A first push block is arranged at the rear end of the piston rod. A one-way flow device is arranged on the rear surface of the first push block. A first sealing rubber pad is arranged on the rear surface of the first push block. A second push block is annularly arranged on the surface of the piston rod. A second sealing rubber pad is annularly arranged on the rear surface of the second push block. A sealing device is arranged on the rear inner wall of the first brake chamber. A first limiting block is arranged on the front surface of the second push block. A first spring is arranged between the rear surface of the first push block and the rear inner wall of the second brake chamber.

[0007] Preferably, the one-way flow device includes a first support seat. A first through hole is formed on the surface of the first push block. The inner wall of the first through hole is in interference fit and sleeved on the first support seat. A second through hole is formed on the front inner wall of the first support seat. A steel ball is arranged at the rear end of the second through hole. An oil passage hole is arranged inside the piston rod. One end of the oil passage hole is communicated with the second through hole, and the other end of the oil passage hole is communicated with the first brake cavity. A second support seat is arranged on the rear inner wall of the first support seat. A third through hole is formed on the rear inner wall of the second support seat. A second spring is arranged between the rear inner wall of the second support seat and the steel ball. An installation ring is annularly arranged on the rear surface of the first support seat. The rear surface of the installation ring is connected to the first spring.

[0008] Preferably, the sealing device includes a plurality of installation cavities. A second limiting block is arranged inside each of the plurality of installation cavities. A sliding rod is arranged on the front surface of each of the plurality of second limiting blocks. One end of each of the plurality of sliding rods penetrates through the front inner wall of the installation cavity and is provided with a sealing seat. The inner diameter of the sealing seat is larger than the diameter of the first push block. A third spring is arranged between the front surface of the second limiting block and the front inner wall of the installation cavity.

[0009] Preferably, a plurality of first positioning grooves are arranged on the rear surface of the first push block. A plurality of first positioning protrusions are arranged on the front surface of the first sealing rubber pad. The plurality of first positioning grooves correspond to the first positioning protrusions one by one, and the first positioning protrusions extend into the first positioning grooves.

[0010] Preferably, the inner diameter of the front part of the first sealing rubber pad is smaller than the inner diameter of the rear part of the first sealing rubber pad.

[0011] Preferably, a plurality of second positioning grooves are arranged on the rear surface of the second push block. A plurality of second positioning protrusions are arranged on the front surface of the second sealing rubber pad. The plurality of second positioning grooves correspond to the second positioning protrusions one by one, and the second positioning protrusions extend into the second positioning grooves.

[0012] The beneficial effects of the plunger brake pump for automobiles proposed by the present utility model are as follows: When an external force acts on the piston rod, the piston rod is pushed to move backward, and the second sealing rubber pad is pressed against the sealing device. Through the third spring of the sealing device, the sealing seat is pressed against the second sealing rubber pad. When the piston rod reaches the end, the sealing seat completely presses against the second sealing rubber pad, and the hydraulic oil will be in a sealed state and will not flow back. At the same time, the steel ball of the one-way flow device is subjected to the pressure of the second brake cavity, so that the one-way flow device is in a sealed state. The first sealing rubber pad forms the first sealing barrier, and the sealing device forms the second barrier. Even if the first sealing rubber pad is worn due to long-term friction, there is still the sealing device to ensure that the brake pump is in a sealed state. When the second sealing rubber pad is worn, the compression force of the third spring can also compensate for the wear amount to ensure that when the piston rod reaches the end, even if the pressure in the second brake cavity is too high, the hydraulic oil will not flow out from the two sealing barriers, ensuring that the brake pump achieves the desired braking effect. Brief Description of the Drawings

[0013] Figure 1 is a cross-sectional view of the structure of the braking state of the present utility model;

[0014] Figure 2 is a schematic diagram of the structure of the non-braking state of the present utility model;

[0015] Figure 3 is an enlarged view of position A of the present utility model;

[0016] Figure 4 is an enlarged view of position B of the present utility model;

[0017] Figure 5 is an enlarged view of position C of the present utility model.

[0018] In the figure: brake pump body 1, oil inlet hole 2, oil outlet hole 3, first brake chamber 4, second brake chamber 5, piston rod 6, first push block 7, first sealing gasket 8, second push block 9, second sealing gasket 10, first limit block 11, first spring 12, first support seat 13, steel ball 14, oil passage hole 15, second support seat 16, second spring 17, mounting ring 18, mounting cavity 19, second limit block 20, slide bar 21, sealing seat 22, third spring 23, first positioning groove 24, first positioning convex block 25, second positioning groove 26, second positioning convex block 27. Detailed Description of the Preferred Embodiment

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0020] Referring to Figures 1-5 , a plunger-type brake pump for an automobile includes a brake pump body 1. An oil inlet hole 2 and an oil outlet hole 3 are provided on the upper surface of the brake pump body 1. A first brake chamber 4 and a second brake chamber 5 are provided inside the brake pump body 1. The diameter of the first brake chamber 4 is larger than that of the second brake chamber 5, which is convenient for installing the sealing device. The oil inlet hole 2 is provided above the first brake chamber 4, and the oil outlet hole 3 is provided above the second brake chamber 5. A piston rod 6 is provided inside the first brake chamber 4 and the second brake chamber 5. A first push block 7 is provided at the rear end of the piston rod 6. A one-way flow device is provided on the rear surface of the first push block 7. A first sealing gasket 8 is provided on the rear surface of the first push block 7. A second push block 9 is annularly provided on the surface of the piston rod 6. A second sealing gasket 10 is annularly provided on the rear surface of the second push block 9. A sealing device is provided on the rear inner wall of the first brake chamber 4. A first limit block 11 is provided on the front surface of the second push block 9. The first limit block 11 plays a role in limiting. A first spring 12 is provided between the rear surface of the first push block 7 and the rear inner wall of the second brake chamber 5. The first spring 12 plays a role in resetting the brake pump.

[0021] In this embodiment, the unidirectional flow device includes a first support seat 13. A first through hole is formed on the surface of the first push block 7, and the inner wall of the first through hole is sleeved on the first support seat 13 by interference fit. A second through hole is formed on the front inner wall of the first support seat 13, a steel ball 14 is arranged at the rear end of the second through hole, an oil passage hole 15 is arranged inside the piston rod 6, one end of the oil passage hole 15 communicates with the second through hole, and the other end of the oil passage hole 15 communicates with the first brake cavity 4. A second support seat 16 is arranged on the rear inner wall of the first support seat 13, a third through hole is arranged on the rear inner wall of the second support seat 16, and the third through hole serves to connect the second through hole and the oil passage hole 15. A second spring 17 is arranged between the rear inner wall of the second support seat 16 and the steel ball 14. An installation ring 18 is annularly arranged on the rear surface of the first support seat 13, and the rear surface of the installation ring 18 is connected to the first spring 12.

[0022] In this embodiment, the sealing device includes a plurality of installation cavities 19. A second limiting block 20 is arranged inside each of the plurality of installation cavities 19. A sliding rod 21 is arranged on the front surface of each of the plurality of second limiting blocks 20. One end of each of the plurality of sliding rods 21 penetrates through the front inner wall of the installation cavity 19 and is provided with a sealing seat 22. The inner diameter of the sealing seat 22 is larger than the diameter of the first push block 7. A third spring 23 is arranged between the front surface of the second limiting block 20 and the front inner wall of the installation cavity 19.

[0023] In this embodiment, a plurality of first positioning grooves 24 are arranged on the rear surface of the first push block 7, a plurality of first positioning protrusions 25 are arranged on the front surface of the first sealing rubber pad 8, the plurality of first positioning grooves 24 correspond to the first positioning protrusions 25 one by one, and the first positioning protrusions 25 extend into the first positioning grooves 24. By gluing the first positioning protrusions 25 and the first positioning grooves 24, the connection between the first sealing rubber pad 8 and the first push block 7 is made more firm.

[0024] In this embodiment, the inner diameter of the front part of the first sealing rubber pad 8 is smaller than the inner diameter of the rear part of the first sealing rubber pad 8. The hydraulic oil in the second brake cavity 5 pushes the inner wall of the first sealing rubber pad 8, so that the first sealing rubber pad 8 is sealed more tightly.

[0025] In this embodiment, a plurality of second positioning grooves 26 are arranged on the rear surface of the second push block 9, a plurality of second positioning protrusions 27 are arranged on the front surface of the second sealing rubber pad 10, the plurality of second positioning grooves 26 correspond to the second positioning protrusions 27 one by one, and the second positioning protrusions 27 extend into the second positioning grooves 26. By gluing the second positioning protrusions 27 and the second positioning grooves 26, the connection between the second sealing rubber pad 10 and the second push block 9 is made more firm.

[0026] Working principle: When the piston rod 6 is subjected to an external force, it pushes the piston rod 6 to move backward. Through the second sealing gasket 10, it presses against the sealing device. Through the third spring 23 of the sealing device, the sealing seat 22 presses against the second sealing gasket 10. When the piston rod 6 reaches the end, the sealing seat 22 completely presses against the second sealing gasket 10, and the hydraulic oil will be in a sealed state and will not flow back. At the same time, the steel ball 14 of the one-way flow device is subjected to the pressure of the second brake chamber 5, making the one-way flow device in a sealed state, and the brake pump is in a braking state, as Figure 1 . The first sealing gasket 8 forms the first sealing barrier, and the sealing device forms the second barrier to ensure that when the piston rod 6 reaches the end, if the pressure in the second brake chamber 5 is too high, the hydraulic oil will not flow out through the two sealing barriers, ensuring that the brake pump achieves the desired braking effect. When the piston rod 6 is not subjected to an external force, through the compression force of the first spring 12, it pushes the first push block 7 to move forward. The hydraulic oil enters through the oil passage hole 15. The steel ball 14 is subjected to the backward thrust of the hydraulic oil, and the steel ball 14 moves backward, making the hydraulic pressure in the first brake chamber 4 and the second brake chamber 5 tend to be balanced, reducing the resistance of the first spring 12 to push. When it reaches the specified position, the brake pump is in a non-braking state, as Figure 2 .

[0027] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A plunger brake pump for an automobile, comprising a brake pump body (1), characterized in that, An oil inlet hole (2) and an oil outlet hole (3) are provided on the upper surface of the brake pump body (1). A first brake chamber (4) and a second brake chamber (5) are provided inside the brake pump body (1). The oil inlet hole (2) is arranged above the first brake chamber (4), and the oil outlet hole (3) is arranged above the second brake chamber (5). A piston rod (6) is provided inside the first brake chamber (4) and the second brake chamber (5). A first push block (7) is provided at the rear end of the piston rod (6). A one-way flow device is provided on the rear surface of the first push block (7). A first sealing gasket (8) is provided on the rear surface of the first push block (7). A second push block (9) is annularly arranged on the surface of the piston rod (6). A second sealing gasket (10) is annularly arranged on the rear surface of the second push block (9). A sealing device is provided on the rear inner wall of the first brake chamber (4). A first limit block (11) is provided on the front surface of the second push block (9). A first spring (12) is provided between the rear surface of the first push block (7) and the rear inner wall of the second brake chamber (5).

2. The plunger brake pump for an automobile according to claim 1, wherein The one-way flow device includes a first support seat (13). A first through hole is formed on the surface of the first push block (7). The inner wall of the first through hole is in interference fit with the first support seat (13). A second through hole is formed on the front inner wall of the first support seat (13). A steel ball (14) is provided at the rear end of the second through hole. An oil through hole (15) is provided inside the piston rod (6). One end of the oil through hole (15) is open and communicated with the second through hole, and the other end of the oil through hole (15) is open and communicated with the first brake chamber (4). A second support seat (16) is provided on the rear inner wall of the first support seat (13). A third through hole is provided on the rear inner wall of the second support seat (16). A second spring (17) is provided between the rear inner wall of the second support seat (16) and the steel ball (14). An installation ring (18) is annularly arranged on the rear surface of the first support seat (13). The rear surface of the installation ring (18) is connected to the first spring (12).

3. The plunger brake pump for automobiles according to claim 1, characterized in that, The sealing device includes a plurality of installation cavities (19). A second limit block (20) is provided inside each of the plurality of installation cavities (19). A slide bar (21) is provided on the front surface of each of the plurality of second limit blocks (20). One end of each of the plurality of slide bars (21) penetrates through the front inner wall of the installation cavity (19) and is provided with a sealing seat (22). The diameter of the inner wall of the sealing seat (22) is larger than the diameter of the first push block (7). A third spring (23) is provided between the front surface of the second limit block (20) and the front inner wall of the installation cavity (19).

4. A plunger brake pump for an automobile according to claim 1, characterized in that, A plurality of first positioning grooves (24) are provided on the rear surface of the first push block (7). A plurality of first positioning bumps (25) are provided on the front surface of the first sealing gasket (8). The plurality of first positioning grooves (24) correspond to the first positioning bumps (25) one by one, and the first positioning bumps (25) are inserted into the first positioning grooves (24).

5. A plunger brake pump for an automobile according to claim 1, characterized in that, The diameter of the front inner wall of the first sealing gasket (8) is smaller than the diameter of the rear inner wall of the first sealing gasket (8).

6. The plunger brake pump for vehicle according to claim 1, wherein, A plurality of second positioning grooves (26) are provided on the rear surface of the second pushing block (9), and a plurality of second positioning bumps (27) are provided on the front surface of the second sealing gasket (10). The plurality of second positioning grooves (26) correspond to the second positioning bumps (27) one by one, and the second positioning bumps (27) extend into the second positioning grooves (26).

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